Drag Reduction Technology with Nanomaterial ShUNP2-10 in Oilfield

Drag reduction with the nanomaterial is a new technique for EOR aiming at the problem of high injection pressure but shortage of injection rate in oilfield. The ShUNP2-10 is a nanomaterial which was prepared for this drag reduction technology. The structure and properties of nanomaterial ShUNP2-10 were characterized by transmission electron microscope (TEM), laser particle analyzer (LPA) and other methods. The microstructure and the wettability of the core surface before and after adsorbed by ShUNP2-10 were investigated. Drag reduction effects of the nanomaterial ShUNP2-10 in microchannels was studied by core displacement experiments (CDE) and field tests. The results show that the ShUNP2-10 is a spherical particle with 10~20nm in diameter, and particle surface have many hydrophilic groups and many hydrophobic groups, but the nanomaterial exhibits high hydrophobic. It was observed that many nanoparticles adsorbed firmly on core surface and formed nanoparticle layers with micro-and nanostructure. The nanolayers changed the core surface wettability from strong hydrophilicity to high hydrophobicity. The water phase permeability (WPP) of these cores displaced with the nanomaterial increased averagely more than 130.6% by CDE and a maximum injection pressure reduction of 12.5 MPa was achieved in-situ test. All these results indicate this nanomaterial ShUNP2-10 has significant drag reduction property and important practical value in Oilfield.